I've been doing almost exactly what jac recommends. I'll study the Gleim and use the Sporty's Study Buddy, and then I'll take a practice test. As my knowledge is expanding, my scores creep up. I'm low 80's right now - regs and airspace still get me sometimes.
One word of caution - I noticed that I was starting to answer some questions correctly since I knew what the answer was from a previous attempt, but not necessarily why the answer was correct. I'm afraid of that biting me in the arse on the oral, so I've been forcing myself to go back and read/learn the information so that I have understanding and can explain each of my answers. That's the only problem I see with the Gleim books. And this is much harder than just learning the answers.
To do that, I have a copy of the Airplane Flying Handbook, The FAR/AIM and Rod Machado's Private Pilot book - which is a huge help on certain things. The man is the master of the understandable analogy.
Good luck.